Canvas causing slowdown in Chrome 23

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  • #1070907


    Hi. I’m getting bad slowdown in the Dashboard when using Chrome. Specifically moving over a link causes the browser to lag when a statistics canvas is on the screen. I suspect this is down to Chrome, but I mention it in case there’s a workaround for WordPress.

    Here’s all I have:

    The problem is that when I move the mouse over a link, the mouse pauses by a fraction of a second. So running the cursor over the links in the main left-hand dashboard menu makes it look like I’m watching a low-framerate webcast – slow and jerky.

    The problem only occurs when a stats graph is on the screen (e.g. the visitor stats on the dashboard home, or the main site stats graph).

    It only occurs with links – when the mouse is over text areas (or the bars of the graphs themselves) it behaves fine. The links under the main stats graph (‘views today’ and ‘busiest day’) do trigger the slowdown.

    The problem goes away if I reduce the size of the browser window and scroll the page so the charts are not visible.

    It also goes away if I use the inspector in Chrome to delete the canvas nodes that contain the graphs.

    Turning off all Chrome extensions has no effect on the problem.

    If I enable the Web Developer Toolbar extension and disable CSS, the problem remains – I think the canvas is still being rendered but isn’t visible, because shrinking the view area makes the problem go away, as abobe).

    If I disable Javascript, the problem goes away (the graphs don’t get rendered).

    Firefox on the same machine doesn’t have the problem.

    My version of Chrome is 23.0.1271.64 (Official Build 165188) m.

    Here are the reports from chrome://gpu – I’m unable to do anything about the drivers myself, as it’s a work machine. But as I say, Firefox (16.0.2) is fine:

    Graphics Feature Status
    Canvas: Software only. Hardware acceleration disabled.
    Compositing: Hardware accelerated
    3D CSS: Unavailable. Hardware acceleration unavailable
    CSS Animation: Software only, hardware acceleration unavailable
    WebGL: Hardware accelerated
    WebGL multisampling: Unavailable. Hardware acceleration unavailable
    Flash 3D: Unavailable. Hardware acceleration unavailable
    Flash Stage3D: Unavailable. Hardware acceleration unavailable
    Texture Sharing: Hardware accelerated
    Video Decode: Software only, hardware acceleration unavailable
    Video: Software only, hardware acceleration unavailable
    Problems Detected
    Intel drivers older than on Windows XP are possibly unreliable.: 74212
    Disable 3D (but not Stage3D) in Flash on XP: 134885
    Accelerated 2D canvas is unavailable: either disabled at the command line or not supported by the current system.

    If there’s anything I can try (as a non-administrator) to fix this, I’ll have a go and report back. I haven’t noticed any similar lag on other sites while using Chrome – for example sites listed on seem to behave fine.

    Hope that’s enough info – if there’s anything else I can supply, let me know.


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